In that case you could probably argue both, in that they are synchronized by the operator’s intention, the identical nature of the programs being run, as well a

In that case you could probably argue both, in that they are synchronized by the operator’s intention, the identical nature of the programs being run, as well as each computer’s ability to identically do so and output the same values. Synchronicity could be just that. Two systems responding to inputs in similar/identical ways, because they evolved to do so or were made to do so. Both functions of the overarching nature of cause and effect. It gets more interesting when you let those two computers talk to each other and each becomes an input for the other. Interference and synchronization abounds.